20001201011191 has 2 divisors, whose sum is σ = 20001201011192. Its totient is φ = 20001201011190.

The previous prime is 20001201011149. The next prime is 20001201011213. The reversal of 20001201011191 is 19111010210002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20001201011191 - 2¹⁹ = 20001200486903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001201011111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000600505595 + 10000600505596.

It is an arithmetic number, because the mean of its divisors is an integer number (10000600505596).

Almost surely, 2^{20001201011191} is an apocalyptic number.

20001201011191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001201011191 is an equidigital number, since it uses as much as digits as its factorization.

20001201011191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 20001201011191 its reverse (19111010210002), we get a palindrome (39112211221193).

The spelling of 20001201011191 in words is "twenty trillion, one billion, two hundred one million, eleven thousand, one hundred ninety-one".